package com.lipi.mall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.lipi.common.exception.NoStockException;
import com.lipi.common.to.mq.OrderTO;
import com.lipi.common.to.mq.StockDetailTO;
import com.lipi.common.to.mq.StockLockedTO;
import com.lipi.common.utils.R;
import com.lipi.mall.ware.entity.WareOrderTaskDetailEntity;
import com.lipi.mall.ware.entity.WareOrderTaskEntity;
import com.lipi.mall.ware.feign.OrderFeignService;
import com.lipi.mall.ware.feign.ProductFeignService;
import com.lipi.mall.ware.service.WareOrderTaskDetailService;
import com.lipi.mall.ware.service.WareOrderTaskService;
import com.lipi.mall.ware.vo.OrderItemVO;
import com.lipi.mall.ware.vo.OrderVO;
import com.lipi.mall.ware.vo.SkuHasStockVO;
import com.lipi.mall.ware.vo.WareSkuLockVO;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lipi.common.utils.PageUtils;
import com.lipi.common.utils.Query;

import com.lipi.mall.ware.dao.WareSkuDao;
import com.lipi.mall.ware.entity.WareSkuEntity;
import com.lipi.mall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService orderTaskService;

    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if (StringUtils.isNotEmpty(skuId) && !skuId.equalsIgnoreCase("0")) {
            wrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (StringUtils.isNotEmpty(wareId) && !wareId.equalsIgnoreCase("0")) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //判断仓库中是否存在该条库存记录，若没有，为新增操作
        List<WareSkuEntity> selectList = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        //新增库存
        if (selectList == null || selectList.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();

            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);

            wareSkuEntity.setStockLocked(0);

            //查询sku的名字,如果失败,事务无需回滚
            //不回滚的操作方法
            //1、catch
            //2、todo 分布式事务
            try {
                R r = productFeignService.info(skuId);
                if (r.getCode() == 0) {
                    Map<String, Object> data = (Map) r.get("skuinfo");
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }

            } catch (Exception e) {

            }


            wareSkuDao.insert(wareSkuEntity);
        }
        //增加库存
        wareSkuDao.addStock(skuId, wareId, skuNum);
    }

    @Override
    public List<SkuHasStockVO> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVO> collect = skuIds.stream()
                .map(skuId -> {
                    SkuHasStockVO vo = new SkuHasStockVO();
                    vo.setSkuId(skuId);

                    Long count = this.baseMapper.selectSkuHasStock(skuId);
                    if (count != null) {
                        vo.setHasStock(count > 0);
                        return vo;
                    } else {
                        vo.setHasStock(false);
                        return vo;
                    }

                })
                .collect(Collectors.toList());
        return collect;
    }


    /**
     * 库存解锁场景
     * 下订单成功，订单过期未支付或被用户点击取消
     * 下订单业务，锁库存之后的业务逻辑异常，订单回滚
     */
    @Transactional
    @Override
    public Boolean lockStock(WareSkuLockVO vo) {

        /**
         * todo 实际上,锁库存时会对库存进行分区,在一个区域内优先选择最近的仓库来发货,
         *  若该区域无货,还要根据业务场景选择是否调货,该版本不做此种逻辑
         **/

        /**
         * 保存库存工作单的详情。
         * 用以追溯哪个订单锁定的库存。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        //1、按照下单的收货地址，找到一个就近仓库，锁定库存。
        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVO> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //     1： 1 - 2 - 1   2：2-1-2  3：3-1-1(x)
            for (Long wareId : wareIds) {
                //成功就返回1,否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTO lockedTo = new StockLockedTO();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTO stockDetailTo = new StockDetailTO();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
//                    rabbitTemplate
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    //当前仓库锁失败，重试下一个仓库
                }
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }


        //3、肯定全部都是锁定成功过的

        return true;
    }


    /**
     *
     * @param to
     */
    @Override
    public void unlockStock(StockLockedTO to) {


        StockDetailTO detail = to.getDetail();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存信息。
        //  有：证明库存锁定成功了
        //    解锁：订单情况。
        //          1、没有这个订单。必须解锁
        //          2、有这个订单。不是解锁库存。
        //                订单状态： 已取消：解锁库存
        //                          没取消：不能解锁
        //  没有：库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVO data = r.getData(new TypeReference<OrderVO>() {
                });
                if (data == null || data.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消了。才能解锁库存
                    //detailId
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁。
                throw new RuntimeException("远程服务失败");
            }

        } else {
            //无需解锁
        }

    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了。
    //导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTO orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询库存工作单entity
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有 没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));

        //Long skuId, Long wareId, Integer num, Long taskDetailId
        // 将未解锁的库存解锁
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    /**
     * 1、库存自动解锁。
     * 下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁。
     * 2、订单失败。
     * 锁库存失败
     * <p>
     * <p>
     * 只要解锁库存的消息失败。一定要告诉服务解锁失败。
     */

    /**
     * 解锁库存具体方法
     * @param skuId
     * @param wareId
     * @param num
     * @param taskDetailId
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(entity);
    }


    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}